CACG/CAHG & CACH/CAHH
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. B [082509]
47
CACH/CAHH Controller Features
Short Cycle Protection (ASCT)
The electronic control incorporates an anti-
short-cycle timer (ASCT) feature designed
to protect the compressor from short cycling.
The ASCT is activated immediately following
the off cycle of the outdoor unit. Once the
room temperature is satisfied and the outdoor
unit switches off, the ASCT will not allow the
outdoor unit to restart unit a three-minute
time period has elapsed.
This feature will prevent the compressor
and heat source from rapid restarts. Once
switched off, or following a power outage, the
compressor or heat source shall not restart for
a minimum of three minutes.
Staggered Start protection
Designed for systems with electric heat, in
heat pump and dry modes the staggered-start
feature will prevent the compressor and elec-
tric heater from starting simultaneously. There
is a thirty-second delay between the start of
the compressor and start of the electric heater
while in Dry mode and Heat pump mode.
Minimum run time
Once started, the minimum on-time prevents
either the compressor or heat source from
cycling off prematurely. The minimum on-
time for both the compressor and electric
heat is two minutes. Minimum on-time is
available only while the control is configured
for Unit mounted keypad operation. Mini-
mum on-times are disabled while in Remote
thermostat mode.
LCD Back Light
The LCD display can be illuminated using the
LCD back light feature. The selectable settings
are Off, On, and Intermittent, and can be set
in the Configuration.
By selecting OFF, the backlight will re-
•
main off at all times.
By selecting ON, the backlight will remain
•
on at all times, including while in the Off
mode interface.
If Intermittent is selected, the backlight
•
will remain for 10 seconds after the
push of any button while the control is
in the On mode or after the push of the
ON/OFF button while in the Off mode
interface.
Drain Pan Sensor
The drain pan sensors monitor the condensate
level in each of the units drain pans. Should
the water in either pan reach a critical level,
the monitor will automatically signal the main
control unit. The controls microprocessor
will, in turn, switch off the condensing unit
for a minimum of three minutes and until the
fault condition has been cleared, to prevent
further condensate production. A fault code,
E02, will then flash on the controller’s LCD
display and will automatically reset once the
fault condition is cleared.
Annunciation
The unit is equipped with an annunciation fea-
ture — the controller will beep, providing the
user with audio feedback confirming that the
microprocessor has received its commands.
The annunciation feature must be activated
in the configuration. The selections are OFF
and ON. If OFF is selected, annunciation will
remain off. If ON is selected, then annuncia-
tion will beep with the push of any button in
the On mode or with the push of the ON/
OFF button while in the off mode.
While in Remote thermostat mode, only the
FAN and TIME buttons are activated and will
beep when pressed.
Memory Backup
In the event of a power failure the control will
retain all of it’s settings, including the mode
of operation. When power is restored, the
control will return to the mode of operation
that it was in prior to the power failure, after
a three minute time delay.
